First look at the doorway: rust learning from the hello world (1)

Hello, this is Lu Ming. Starting from this article, I will learn rust with you. Before starting, you need to complete the installation of the rust toolchain.

your tools. You can use any editor to write rust code . I prefer VSCode. It is free, powerful and fast. I installed some plug-ins under VSCode to provide efficiency, you can also refer to it if you are interested:

• rust-analyzer: Compile and analyze your rust code in real time, prompting errors in the code, and marking the type
• rust syntax: provide syntax highlighting for your rust code
• crates: help you analyze whether the dependencies of the current project are the latest version
• better toml: rust uses toml for project configuration management, it can help you syntax highlighting and show errors in toml files
• rust test lens: can help you quickly run a certain rust test
• tabnine: AI-based auto-completion can help you write code faster

Now, in accordance with tradition, let's write the first rust program by hand. We use cargo new on the local command line to create the project.

> cargo new hello
     Created binary (application) `hello` package

At this point, it will automatically help us create an executable project hello, the entry is in src/main.rs, the project configuration is in the Cargo.toml file, println! is a macro function in rust, which can simplify our code.

// 项目入口
fn main() {
    println!("Hello, world!");
}

[package]
name = "hello"
version = "0.1.0"
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]

Enter this project directory, we run cargo run, after editing, the program starts to run.

> cd .\hello\
> cargo run
Compiling hello v0.1.0 (F:\projects\start-rust\hello)
    Finished dev [unoptimized + debuginfo] target(s) in 1.67s
     Running `target\debug\hello.exe`
Hello, world!

Our first rust program ran successfully!